Dual Correlation Frame Synchronization for UWB Receivers
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Solution Overview
Problem
Existing frame synchronization methods in receivers are vulnerable to extraneous phase changes, particularly in ultra-wideband communications, and struggle to distinguish between different preamble sizes.
Innovation Solution
A dual correlation method is employed, using separate correlations for synchronization and channel equalization patterns to determine the start of the channel equalization portion of the preamble, which is not reliant on phase changes and can differentiate between standard and short preambles.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If frame synchronization relies on phase changes during the synchronization portion of the preamble, then synchronization can be established, but the system becomes vulnerable to extraneous phase changes caused by perturbations within the analog portion of the transceiver
Solution Approach 1:
The patent divides the correlation process into two separate correlations: one for the synchronization pattern (sync correlation) and one for the channel equalization pattern (CE correlation). By segmenting the correlation function and comparing the two correlations, the system determines the start of the channel equalization symbols without relying on phase changes, thereby resolving the vulnerability to extraneous phase changes while maintaining synchronization reliability.
2Adaptability or versatility
If a single correlation method is used for frame synchronization, then the system is simpler to implement, but it cannot distinguish between preambles of differing sizes such as standard preamble and short preamble
Solution Approach 1:
The patent adds a comparative dimension to the synchronization process by introducing a second correlation (CE correlation) in addition to the traditional sync correlation. This dimensional expansion enables the system to distinguish between different preamble sizes by comparing the relative magnitudes of the two correlations, while the comparison logic itself remains relatively simple, thus achieving adaptability without excessive complexity.
Data Source
AI summary
A system and method utilize a dual correlation, one for the synchronization pattern (sync correlation) and one for the channel equalization pattern (CE correlation), to determine where the channel equalization pattern starts and thus establish frame synchronization. The system and method compare the two correlations and decides on the start of the channel equalization symbols when the CE correlation is larger than the sync correlation.